.aboutus_box{
    width: 100%;
    min-width: 1280px;
    background-color: #fefefe;
}
.aboutus_box>div {
    width: 1280px;
    margin: 0 auto;
}

.aboutus_box .jianjie>img {
    display: block;
    width: 320px;
    margin: 230px auto 170px;
}
.aboutus_box .jianjie_cnt{
    width: 1280px;
    height: 705px;
    margin: 0 auto;
    background-image: url(/img/aboutus/jianjie_cnt.png);
    background-size: 100%;
    overflow: hidden;
}
.aboutus_box .jianjie_cnt .jianjie_wenzi{
    display: block;
    width: 510px;
    margin-top: 166px;
    margin-left: 100px;
}
.aboutus_box .jianjie_cnt h3{
    font-size: 22px;
    font-weight: bold;
    margin-bottom: 60px;
}
.aboutus_box .jianjie_cnt span{
    display: block;
    font-size: 18px;
    letter-spacing: 1px;
    line-height: 30px;
}
.aboutus_box .licheng>img {
    display: block;
    width: 320px;
    margin: 230px auto 170px;
}
.aboutus_box .licheng_cnt{
    width: 1280px;
    height: 1180px;
}

.aboutus_box .licheng_cnt li{
    float: left;
    width: 639px;
    height: 1180px;
}
.aboutus_box  li.licheng_left{
    border-right: 1px solid #232323;
}

.aboutus_box  li.licheng_right {
    border-left: 1px solid #232323;
}

.aboutus_box .licheng_cnt p{
    position: relative;
    display: block;
    width: 600px;
    height: 100px;
    margin-top: 150px;
}
.aboutus_box .licheng_cnt b{
    display: block;
    float: left;
    width: 180px;
    height: 100px;
    text-align: center;
    line-height: 100px;
    font-size: 40px;
    color: #fefefe;
    background-size: 100%;
    background-repeat: no-repeat;
}
.aboutus_box li.licheng_left b {
    background-image: url(/img/aboutus/red_left.png)
}
.aboutus_box li.licheng_right b {
    background-image: url(/img/aboutus/red_right.png)
}
.aboutus_box .licheng_cnt span{
    display: block;
    float: left;
    width: 420px;
    height: 100px;
    background-color: #c1c1c1;
}

